<?php
?>
<html>
<body>

<table border="1">
    <tr>
        <th><input type="checkbox" onclick="swapCheck()" /></th>
        <th>Month</th>
        <th>Savings</th>
    </tr>
    <tr>
        <td><input type="checkbox" /></td>
        <td>January</td>
        <td>$100</td>
    </tr>
    <tr>
        <td><input type="checkbox" /></td>
        <td>February</td>
        <td>$150</td>
    </tr>
</table>

<script type="text/javascript"
        src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>

<script type="text/javascript">
    //checkbox 全选/取消全选
    var isCheckAll = false;
    function swapCheck() {
        if (isCheckAll) {
            $("input[type='checkbox']").each(function() {
                this.checked = false;
            });
            isCheckAll = false;
        } else {
            $("input[type='checkbox']").each(function() {
                this.checked = true;
            });
            isCheckAll = true;
        }
    }
</script>

</body>
</html>
